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We had this on before the Dark times, its worth putting up again, one of the best illusions there is!

If you look at the spinning girl's silhouette below, you will think it is spinning clockwise, probably. When you check her shadow below, momentarily the spinning direction changes in your mind, and now the girl is spinning counter-clockwise. It can be quite hard at the beginning to notice switch of the spinning direction, but eventually you'll manage.

This is what's known as an example of visual ambiguity, created by the lack of color and details that help us judge depth.. Probably the most famous, most familiar image demonstrating visual ambiguity is the Necker Cube: